Free 1Z0-819 Questions for Oracle 1Z0-819 Exam

Question #1

Given:

After which line can we insert assert i < 0 || values[i] <= values[i + 1]; to verify that the values array is partially sorted?

A. after line 6

B. after line 10

C. after line 5

D. after line 8

Discussion 0

Correct Answer: A Vote an answer

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Question #2

Given:

and

Which code fragment on line 1 makes the s1 set contain the names of all employees born before January 1, 1989?

A. Option B

B. Option A

C. Option D

D. Option C

Discussion 0

Correct Answer: A Vote an answer

Question #3

Given:

Which two lines can replace line 1 so that the Y class compiles? (Choose two.)

A. super.set(List<String> map)

B. super.set(map.values());

C. map.forEach((k, v) -> set(v)));

D. set(map.values());

E. set(map)

Discussion 0

Correct Answer: B,D Vote an answer

Question #4

Given:
List<String> longlist = List.of("Hello","World","Beat");
List<String> shortlist = new ArrayList<>();
Which code fragment correctly forms a short list of words containing the letter "e"?

A. Option B

B. Option A

C. Option D

D. Option C

Discussion 0

Correct Answer: C Vote an answer

Question #5

Given an application with a main module that has this module-info.java file:

Which two are true? (Choose two.)

A. An implementation of country.countryDetails can be added to the main module.

B. To run without an error, the application must have at least one module in the module path that provides an implementation of country.CountryDetails.

C. To compile without an error, the application must have at least one module in the module source path that provides an implementation of country.CountryDetails.

D. A module providing an implementation of country.CountryDetails can be compiled and added without recompiling the main module.

E. A module providing an implementation of country.CountryDetails must have a requires main; directive in its module-info.java file.

Discussion 0

Correct Answer: C,E Vote an answer

Question #6

Given:

What is the result?

A. The compilation fails.

B. 1.99,2.99,0.0

C. 1.99,2.99,0

D. 1.99,2.99

Discussion 0

Correct Answer: B Vote an answer

Question #7

Which module-info.java is correct for a service provider for a print service defined in the PrintServiceAPI module?

A. module PrintServiceProvider {
requires PrintServiceAPI;
exports org.printservice.spi.Print with
D18912E1457D5D1DDCBD40AB3BF70D5D
com.provider.PrintService;
}

B. module PrintServiceProvider {
requires PrintServiceAPI;
uses com.provider.PrintService;
}

C. module PrintServiceProvider {
requires PrintServiceAPI;
provides org.printservice.spi.Print with
com.provider.PrintService;
}

D. module PrintServiceProvider {
requires PrintServiceAPI;
exports org.printservice.spi;
}

Discussion 0

Correct Answer: D Vote an answer

Question #8

Consider this method declaration:

A) "SET SESSION AUTHORIZATION " + user
B) "SET SESSION AUTHORIZATION " + stmt.enquoteIdentifier(user)
Is A or B the correct replacement for <EXPRESSION> and why?

A. A, because it sends exactly the value of user provided by the calling code.

B. A, because it is unnecessary to enclose identifiers in quotes.

C. A and B are functionally equivalent.

D. B, because all values provided by the calling code should be enquoted.

E. B, because enquoting values provided by the calling code prevents SQL injection.

Discussion 0

Correct Answer: A Vote an answer

Question #9

Given:
var fruits = List.of("apple", "orange", "banana", "lemon");
You want to examine the first element that contains the character n. Which statement will accomplish this?

A. Optional<String> result = fruits.stream().filter(f -> f.contains ("n")).findFirst ();

B. String result = fruits.stream().filter(f -> f.contains("n")).findAny();

C. fruits.stream().filter(f -> f.contains("n")).forEachOrdered(System.out::print);

D. Optional<String> result = fruits.stream().anyMatch(f -> f.contains("n"));

Discussion 0

Correct Answer: C Vote an answer

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Question #10

Given the code fragment:

What is the result?

A. ghi jkl

B. The compilation fails.

C. An ArrayIndexOutofBoundsException is thrown at runtime.

D. gh ij kl

E. gj hk il

Discussion 0

Correct Answer: C Vote an answer

Question #11

Given:

What is the result?

A. 3, 4

B. 3, 4, 3

C. The program prints 3 4 and throws a ClassCastException

D. 3, 4, 3, 14

Discussion 0

Correct Answer: C Vote an answer

Question #12

Which two statements are true about the modular JDK? (Choose two.)

A. APIs are deprecated more aggressively because the JDK has been modularized.

B. It is possible but undesirable to configure modules' exports from the command line.

C. An application must be structured as modules in order to run on the modular JDK.

D. The foundational APIs of the Java SE Platform are found in the java.base module.

Discussion 0

Correct Answer: B,D Vote an answer

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